93 400E Stock Radio Question

First thing... I know why ask about that get a new aftermarket and be
done with it.
I can't, that mercedes symbol and leaving it stock with stock
accessories is giving me all the enjoyment. It looks like its supposed

to be there.
So here is the question... When I speed up it gets louder, when I
brake volume gets lower and when I hit bumps it kinda gets quieter
kinda. I have heard that is the amp, does anyone know for sure? The
fader doesnt change anything but what it is supposed to, could it still
be that? A bad ground?
Thanks in advance,
Jason

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